The most common and most likely answer to this crossword clue is the 6 letter word CONFAB
I've seen this crossword clue in Financial Times
C
O
N
F
A
B
More clues leading to the result CONFAB
Buddy explains!

The straight part
We know that "talk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case talk = confab.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CONFAB mean?
CONFAB noun- A casual conversation; a chat.
- A fabricated memory believed to be true.
- To speak casually with; to chat.
- To confer.
- To fabricate memories in order to fill gaps in one's memory.